How to use OPA549 and OPA541?

JojoD818 · 28th September 2003, 01:15 PM

Hi everyone!

I was hoping anyone can help me in building a chipamp using the opa541 and opa549 chips from Burr-Brown.

I found a schematic from an application note, can I use this for the opa549/541 chips?

Regards,
JojoD

JojoD818 · 28th September 2003, 02:54 PM

Ok, I got the sheets for the 549. What are the suitable values for R1 and R2 (Gain) resistors?

till · 28th September 2003, 08:05 PM

i used 10k and 100k

it depends on the gain you want and the input resistance you need. If you need more gain use 10k/200k, if you need more input resitance use 20k/200k and so on.

millwood · 28th September 2003, 08:10 PM

Quote:

Originally posted by JojoD818
What are the suitable values for R1 and R2 (Gain) resistors?

my favorite has been 20k/1k combo, part because I have lots of them. In addition, higher values in theory will cause more noise and higher DC offset. But I never experienced that in my trials.

JojoD818 · 29th September 2003, 04:39 AM

Thanks guys!

Is the pcb design critical? I mean is grounding a big issue?

JojoD

JojoD818 · 29th September 2003, 05:20 AM

I forgot something to ask.... what do I do with the E/S pin? Should I just connect it to the V+?

Regards,
JojoD

Matttcattt · 29th September 2003, 09:07 AM

Quote:

Originally posted by JojoD818
I forgot something to ask.... what do I do with the E/S pin? Should I just connect it to the V+?

Regards,
JojoD

i just snapped off the pin. it does not need to be connected.

JojoD818 · 29th September 2003, 04:05 PM

It's working! Thanks to all who helped!

Sound is very clear and worth the finger twitching caused by so small space.

JojoD

JojoD818 · 16th October 2003, 11:04 AM

Hi guys,

I'm now about to try the OPA541, however, I am not sure how to connect this chip.

Is there realy a resistor in series with the load?

Any diagram or pcb would be helpful. Thanks!

dArk · 4th November 2003, 04:45 PM

Hi all!

I'm new to diy audio stuff, and want to make my first simple chip amps, but I don't know if the schemantic I have is OK for my needs (I think I already blew 2 ICs with the previous I used). I'm using OPA 541/549. I'll be happy if you could look at these 2 test PCBs. Both were made for the OPA 549T, the first test circuit will be powered by a PC ATX power supply since I don't have a dual supply yet, the second by a dual one when I'll get a dual 30V toroid (and have the time to make the regulator etc.) Source will be my sound cards sub out, on the out is a 8ohm sub.

Thanks a lot,

dArk

16th October 2003, 11:04 AM	#9
JojoD818 diyAudio Moderator Join Date: Mar 2003 Location: searching...	OPA541 Hi guys, I'm now about to try the OPA541, however, I am not sure how to connect this chip. Is there realy a resistor in series with the load? Any diagram or pcb would be helpful. Thanks!

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28th September 2003, 08:05 PM	#3
till Banned Join Date: Apr 2002 Location: Germany, Clausthal	i used 10k and 100k it depends on the gain you want and the input resistance you need. If you need more gain use 10k/200k, if you need more input resitance use 20k/200k and so on.

29th September 2003, 04:39 AM	#5
JojoD818 diyAudio Moderator Join Date: Mar 2003 Location: searching...	Thanks guys! Is the pcb design critical? I mean is grounding a big issue? JojoD

29th September 2003, 05:20 AM	#6
JojoD818 diyAudio Moderator Join Date: Mar 2003 Location: searching...	I forgot something to ask.... what do I do with the E/S pin? Should I just connect it to the V+? Regards, JojoD

29th September 2003, 04:05 PM	#8
JojoD818 diyAudio Moderator Join Date: Mar 2003 Location: searching...	It's working! Thanks to all who helped! Sound is very clear and worth the finger twitching caused by so small space. JojoD